PROPERTY, PLANT AND EQUIPMENT - Operating Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Long-term (fixed)	$ 177	$ 225
Long-term (variable)	21	44
Short-term	68	47
Total Operating lease expense	$ 266	$ 317